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The present wind detection model of weather UAV has limitations. In order to detect the wind speed of multi-flight states, the intelligent wind detection system of weather UAV based on the multi-mode variable structure was proposed in this paper. According to the change of acceleration and angular velocity, three detection equations were established. Based on flight motion states, the intelligent wind detection system selected one of the three. The simulation results according to the intelligent wind detection system showed that: the intelligent wind detection system could get higher wind accuracy and can effectively adapt to a variety of flight motion states, system robustness, system engineering to achieve simple and high reliability.